$635 is not bad at all. You can still buy them new at $1699, so $1k less is just fine. Look for a seller who has low useage/low shutter count, and a return policy.
Thanks so much @bdunbar79 & @tron for your assistance. Is 182 rolls of film a lot for a 1V? They want $500.00 for it, and it doesn't come with the PB-E2 Booster. So it's not considered the HS.
Not sure you'd need the battery booster. In film, you don't want to be shooting high burst rates, which the battery booster helps with here in this specific case. $500 is a good deal and I don't believe 182 rolls is so much. Even at 36 shot rolls, that's 6500 shutter actuations, and the camera is rated for 150,000. Even if it breaks, Canon will still fix it. The batteries it takes are fairly cheap.